Your website renders as a big empty blue page in Firefox unless I disable tracking protection (and in my case, since I have noscript, I have to enable javascript for "website-files.com", a domain that sounds totally legit).
A lot of sites like to do things like this for some reason. I haven't figured out why. I like to use Stylus to mitigate these if I can, rather than enabling JavaScript.
(presented as a data point for any poor soul trying to replicate your problem)
Here's an archive link that works without any tracking, ads, Javascript etc.: https://archive.is/F5KZd
How do you manage to navigate the web with that on by default? It breaks just about everything since nothing is a static site these days.